Metal Fracture Modeling

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (20 October 2019) | Viewed by 8210

Special Issue Editor


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Guest Editor
Mechanical Department, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Interests: nonlinear computational mechanics; large deformations in elastoplasticity; finite element architecture; nonlinear contact mechanics; damage and fracture modeling; modelling of material forming; metal forming; glass forming
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Special Issue Information

Dear Colleagues,

I would like to invite you to contribute to this Special Issue on “Metal Fracture Modeling” that will address multiple associated aspects, ranging from constitutive model proposals to numerical solution strategies.

The increased interest in the understanding of ductile fractures is partly prompted by the fact that the conventional damage models and fracture criteria in many situations fail to accurately predict ductile failure, especially for complex loading paths and for new advanced materials. There is the space, but especially the need, for new ideas and proposals to tackle these limitations and to face the associated computational challenges of ductile damage modelling, at both the micro and the macro scales.

A diverse variety of topics could be addressed, comprising:

  • theoretical and numerical aspects related to advanced fully-coupled constitutive equations, including time and space discretization, complex loading conditions involving large plastic straining, non-proportional loading and strain rate effects, shear-loading effects;
  • new mathematical formulations and numerical solution strategies for continuous/discontinuous transitions, size effects, mesh dependence, solution schemes involving non-local methods, phase–field models, XFEM and GFEM approaches;
  • multiscale strategies for modelling ductile fracture, scale-bridging, model order reduction techniques,

and various related topics.

I hope you will contribute to this Special Issue on “Metal Fracture Modeling”.

Prof. Jose Cesar De Sa
Guest Editor

Manuscript Submission Information

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Keywords

  • Ductile damage and fracture
  • phenomenological and micromechanics models
  • numerical modelling
  • multiscale modelling, continuous/discontinuous transition, non-local and phase field regularizations

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Published Papers (2 papers)

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Research

26 pages, 33981 KiB  
Article
The Evolution of Internal Damage Identified by Means of X-ray Computed Tomography in Two Steels and the Ensuing Relation with Gurson’s Numerical Modelling
by Fernando Suárez, Federico Sket, Jaime C. Gálvez, David A. Cendón, José M. Atienza and Jon Molina-Aldareguia
Metals 2019, 9(3), 292; https://doi.org/10.3390/met9030292 - 5 Mar 2019
Cited by 7 | Viewed by 3570
Abstract
This paper analyzes the evolution of the internal damage in two types of steel that show different fracture behaviors, with one of them being the initial material used for manufacturing prestressing steel wires, and the other one being a standard steel used in [...] Read more.
This paper analyzes the evolution of the internal damage in two types of steel that show different fracture behaviors, with one of them being the initial material used for manufacturing prestressing steel wires, and the other one being a standard steel used in reinforced concrete structures. The first of them shows a flat fracture surface perpendicular to the loading direction while the second one shows the typical cup-cone surface. 3 mm-diameter cylindrical specimens are tested with a tensile test carried out in several loading steps and, after each of them, unloaded and analyzed with X-ray tomography, which allows detection of internal damage throughout the tensile test. In the steel used for reinforcement, damage is developed progressively in the whole specimen, as predicted by Gurson-type models, while in the steel used for manufacturing prestressing steel-wire, damage is developed only in the very last part of the test. In addition to the experimental study, a numerical analysis is carried out by means of the finite element method by using a Gurson model to reproduce the material behavior. Full article
(This article belongs to the Special Issue Metal Fracture Modeling)
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10 pages, 1049 KiB  
Article
Multiaxial Fatigue Life Prediction of GH4169 Alloy Based on the Critical Plane Method
by Jianhui Liu, Zhen Zhang, Bin Li and Shanshan Lang
Metals 2019, 9(2), 255; https://doi.org/10.3390/met9020255 - 20 Feb 2019
Cited by 17 | Viewed by 3742
Abstract
The multiaxial fatigue life of GH4169 alloy was predicted based on the critical plane method. In this paper, a new critical plane-damage multiaxial fatigue parameter is proposed, in which the maximum shear strain is considered to be the main damage control parameter, and [...] Read more.
The multiaxial fatigue life of GH4169 alloy was predicted based on the critical plane method. In this paper, a new critical plane-damage multiaxial fatigue parameter is proposed, in which the maximum shear strain is considered to be the main damage control parameter, and the correction parameter, including the normal stress and strain of the maximum shear strain plane, is defined as the second control parameter. The axis of principle strain rotates under non-proportional loading. Meanwhile, the mechanism of the variation of material microstructure and slip systems leads to an additional hardening phenomenon. The ratio of cyclic yield stress to static yield stress is used to represent cyclic strengthening capacity, and the influence of the phase difference and loading condition on the non-proportional reinforcement effect is considered. It is also proposed that different materials have different influences on the additional hardening phenomenon. Meanwhile, the model revision results in stress under asymmetrical loading. Experimental data of GH4169 alloy show that the proposed model can provide better prediction than the Smith–Watson–Topper (SWT) and Fatemi–Socie (FS) models. Full article
(This article belongs to the Special Issue Metal Fracture Modeling)
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